When your kids play nicely together, you bet the camera is coming out to capture it, if only to remind yourself in their less wholesome moments that they can get along.
Filming the two playing quietly together, Luna can be seen patiently painting her little brother's nails, until he adds his own take on the situation, uttering "You know what, chicken butt."
The phrase, which appears to come from nowhere, leaves his famous mum in hysterics, as Luna diligently continues painting and Miles asks, 'What's so funny?'.
The cookbook author and model recently spoke to People magazine for her cover issue about how she and husband John Legend were conscious not to push gender stereotypes on Miles and to let him embrace his emotions.
"Miles is very emotional. He's a lot like me too. He wears his heart on his sleeve, and we embrace that. I think more men should embrace their emotions. I think that's really important in this world," she told the magazine.
"That it's okay to cry, and it's okay to be upset about something or to be sad about something. We're going to talk it through and it's okay."
"There is no 'Be a man' in our house. There's no right way to be a man, and John is so good about showing them through how he treats me how to be a good man, how to be a good father. It's wonderful to see."